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Filters Date Range Past year (12) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts Eben Paxton Stephanie G Yelenik U.S. Geological Survey - ScienceBase U.S. Geological Survey Pacific Island Ecosystems Research Center More... Tag Types Theme (19) Place (19) USGS Scientific Topic Keyword (10) Harvest Set (10) Tag Schemes None (19) USGS Thesaurus (7) ISO 19115 Topic Category (12) Common geographic areas (4) common geographic areas (1) View Results as: JSON ATOM CSV

Light transmittance in experimental plots, Hakalau Forest, Hawaii, 2015 This data release includes data and metadata on 1) avian diet 2) seed rain 3) understory plant composition 4) seedling abundance and 5) sampling locations for these sites. In addition it includes data on seedling abundance, grass cover and light levels for a grass removal/seed addition experiment . All sites were within Hakalau Forest National Wildlife Refuge on Hawaii Island. This study looked at multiple biotic interactions that potentially lead to self-reinforcing feedbacks within intact forest and degraded forest sites. Most of this study was done with sampling, however we also implemented an experiment in which we manipulated grass biomass and seed addition to specifically ask how these factors limit native... Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii, avian diet, botany, ecology, All tags... exotic grass, forest resources, forest restoration, land use change, plant competition, plant ecology, seed limitation, seedling recruitment, tropical forest dynamics, Fewer tags Guam, Mariana swiftlet nest cluster counts, 2019-2023 The yǻyaguak (Mariana swiftlet; Aerodramus bartschi) is an endangered cave-nesting species historically found on Guam and the southern Mariana Islands, Micronesia. The population on Guam has been severely impacted by the introduction of the brown treesnake (Boiga irregularis). Population status assessments have, however, been challenging due to the limitations of traditional counting methods, which rely on visual observations at cave entrances and are prone to inaccuracies. To improve count accuracy, we estimated yǻyaguak population size and relative nesting activity using thermal and near-infrared videography at Mahlac, Maemong and Fachi Caves from April 2019 to April 2023. This study demonstrates the potential... Categories: Data; Tags: Guam, Mariana swiftlet, Talofofo, biota, videographic monitoring, All tags... yǻyaguak, Fewer tags Hawaii Island locations of reintroduced Alala from automated radio telemetry tracking system, 2017 cohort Alala, or Hawaiian Crow (Corvus hawaiiensis), were extinct in the wild since the early 2000s. The first effort to reintroduce captive bred Alala back into the wild was conducted at Puu Makaala Natural Area Reserve on Hawaii Island. The 2017 release cohort were released in two stages and were the only Alala in the wild. Using automated radio telemetry tracking towers (n=4) that were distributed around the release area, we tracked the birds from September 26, 2017, to May 19, 2018, to document early exploratory movement of these birds in the wild. Categories: Data; Tags: Hawaii Island, Puu Makaala Natural Area Reserve, USGS Science Data Catalog (SDC), Wildlife Biology, biota, All tags... birds, reintroduction, Fewer tags Basal stem area of fruiting understory data for Hakalau Forest, Hawaii, 2015-2016 This data release includes data and metadata on 1) avian diet 2) seed rain 3) understory plant composition 4) seedling abundance and 5) sampling locations for these sites. In addition it includes data on seedling abundance, grass cover and light levels for a grass removal/seed addition experiment . All sites were within Hakalau Forest National Wildlife Refuge on Hawaii Island. This study looked at multiple biotic interactions that potentially lead to self-reinforcing feedbacks within intact forest and degraded forest sites. This data, in particular, focuses on the basal area of different species of fruiting plants within 20m of all of the seedrain traps. Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii, avian diet, botany, ecology, All tags... exotic grass, forest resources, forest restoration, land use change, plant competition, plant ecology, seed limitation, seedling recruitment, tropical forest dynamics, Fewer tags Hawaiian forest bird avian malaria prevalence 2018-2021 Native and introduced forest birds were captured and then released across the Hawaiian Islands to acquire a blood sample for obtaining DNA and test for exposure to avian malaria (Plasmodium relictum). A total of 2,945 samples were collected and analyzed for avian malaria prevalence from 39 species captured at 66 sites from Kauai, Oahu, Molokai, Maui, and Hawaii islands. Categories: Data; Tags: Hawai'i Island, Hawaiian forest bird, Kaua'i, Maui, Molokai, All tags... O'ahu, Plasmodium relictum, USGS Science Data Catalog (SDC), Wildlife Biology, Wildlife Disease, avian malaria, biota, disease, Fewer tags O'ahu waterbird movement from 2016 to 2018 This data release includes data and metadata containing estimated and predicted locations of radio telemetered Hawaiian waterbirds. Radio telemetry data was collected using an automated radio telemetry network from March 2016 to August 2018 on O'ahu, Hawaii, for three species: ʻAlae ʻula (Hawaiian Gallinule; Gallinula galeata sandvicensis), ʻAlae keʻokeʻo (Hawaiian Coot; Fulica alai), and Aeʻo (Hawaiian Stilt; Himantopus mexicanus knudseni). Data were used in the analysis for the manuscript entitled " Hawaiian waterbird movement across a developed landscape." Categories: Data; Tags: Hawaii, Hawaiian waterbirds, Oahu Island, Pearl Harbor, USGS Science Data Catalog (SDC), All tags... Wildlife Biology, automatic radio telemetry, biota, movement patterns, Fewer tags Hawaii Island bird activity from 2014 through 2019 We used an automated radio telemetry network to document the activity of radio telemetered Hawaiian forest birds in two study sites, one a continuous forest and the other a fragmented forest. Four bird species were studied: the nectarivorous ʻiʻiwi (Drepanis coccinea) and ʻapapane (Himatione sanguinea), the frugivorous ʻōmaʻo (Myadestes obscurus), and the generalist Hawaiʻi ʻamakihi (Chlorodrepani virens; hereafter ʻamakihi). In the continuous forest we also tracked two non-native species: the frugivorous red-billed leiothrix (Leiothrix lutea), and the generalist warbling white-eye (Zosterops japonicus). Using sequential changes in radio signal strength we were able to estimate when birds were moving or resting.... Categories: Data; Tags: Ecology, Hakalau Forest National Wildlife Refuge, Hawaii Island, Hawaii forest birds, USGS Science Data Catalog (SDC), All tags... Upper Waiakea Forest Reserve, Wildlife Biology, biota, movement patterns, radio telemetry, Fewer tags Hawai‘i Island locations of ‘Apapane and ‘I‘iwi from automated radio telemetry tracking system 2014 to 2016 We used an automated radio telemetry network to track the movement of two nectivorous Hawaiian honeycreepers, the ʻapapane (Himatione sanguinea) and ʻiʻiwi (Drepanis coccinea), collecting high temporal and spatial resolution data across the annual cycle. We identify movement syndromes using a multivariate analysis of multiple movement metrics and assessed seasonal changes in movement behavior. Birds made long-distance flights, including multi-day forays outside the tracking array, but exhibited a high degree of fidelity to a core use area, even in the non-breeding period. Both species visited forests at elevations where avian malaria potentially occurs, although overall exhibited very little seasonal change in elevation... Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii Island, USGS Science Data Catalog (SDC), Wildlife Biology, biota, All tags... birds, movement ecology, telemetry, Fewer tags Guam, Mariana swiftlet colony size and nest counts, 2019-2023 The yǻyaguak (Mariana swiftlet; Aerodramus bartschi) is an endangered cave-nesting species historically found on Guam and the southern Mariana Islands, Micronesia. The population on Guam has been severely impacted by the introduction of the brown treesnake (Boiga irregularis). Population status assessments have, however, been challenging due to the limitations of traditional counting methods, which rely on visual observations at cave entrances and are prone to inaccuracies. To improve count accuracy, we estimated yǻyaguak population size and relative nesting activity using thermal and near-infrared videography at Mahlac, Maemong and Fachi Caves from April 2019 to April 2023. This study demonstrates the potential... Categories: Data; Tags: Guam, Mariana swiftlet, Talofofo, biota, videographic monitoring, All tags... yǻyaguak, Fewer tags Hawaii Island forest bird movement data from 2014 to 2019 This data release includes data and metadata containing estimated and predicted locations of radio telemetered Hawaiian forest birds. Radio telemetry data was collected using an automated radio telemetry network from 2014 to 2019 from birds in two study sites, one a continuous forest and the other a fragmented forest. Four bird species that varied in age and sex were studied: the nectarivorous ʻiʻiwi (Drepanis coccinea) and ʻapapane (Himatione sanguinea), the frugivorous ʻōmaʻo (Myadestes obscurus), and the generalist Hawaiʻi ʻamakihi (Chlorodrepani virens). Data were used in the analysis for the manuscript entitled "Landscape fragmentation alters movement behavior and space use of Hawaiian forest birds." Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii Island, Hawaiian forest birds, USGS Science Data Catalog (SDC), Upper Waiakea Forest Reserve, All tags... Wildlife Biology, automatic radio telemetry, biota, movement patterns, Fewer tags Hawaii Island forest bird response to simulated nest predator 2015-2016 Hawaii forest birds nesting in Hakalau Forest National Wildlife Refuge were exposed to models of predators near their nests to measure behavioral responses. Responses to potential nest predators included vocalization rate, movement behavior, and nestling feeding. Predators were inert stick, introduced but abundant predator, a rat, and a novel predator, a snake, that does not occur on Hawaii. Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii forest birds, Nest predation, USGS Science Data Catalog (SDC), Wildlife Biology, All tags... biota, Fewer tags Oahu Island Hawaiian stilt GPS satellite tracking data, 2017-2018 Lotek Pinpoint Global Positioning System (GPS) Argos Satellite tracking tags were placed on 4 Hawaiian Stilts on Oahu island in 2017. The birds were tracked from 19 July 2017 to 12 February 2018, with locations taken daily every 1.5 hours from 0400 to 2000 Hawaii Standard Time. For each location, a description of the general habitat as 1) Wetland, 2) undeveloped field, 3) sport field, and 4) developed area was determined through a visual evaluation of the location using WorldView-2 satellite imagery. Categories: Data; Tags: Ecology, GPS satellite tracking, Himantopus mexicanus knudseni, Oahu Hawaii, USGS Science Data Catalog (SDC), All tags... Wildlife Biology, biota, Fewer tags Grass Biomass in experimental plots, Hakalau Forest, Hawaii, 2015 This data release includes data and metadata on 1) avian diet 2) seed rain 3) understory plant composition 4) seedling abundance and 5) sampling locations for these sites. In addition it includes data on seedling abundance, grass cover and light levels for a grass removal/seed addition experiment . All sites were within Hakalau Forest National Wildlife Refuge on Hawaii Island. This study looked at multiple biotic interactions that potentially lead to self-reinforcing feedbacks within intact forest and degraded forest sites. Specifically, this data set provides grass biomass data for plots where we implemented a grass removal/seed addition experiment in order to look at how these two factors relate to each other... Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii, avian diet, botany, ecology, All tags... exotic grass, forest resources, forest restoration, land use change, plant competition, plant ecology, seed limitation, seedling recruitment, tropical forest dynamics, Fewer tags Seed rain data for Hakalau Forest, Hawaii, 2015-2016 This data release includes data and metadata on 1) avian diet 2) seed rain 3) understory plant composition 4) seedling abundance and 5) sampling locations for these sites. In addition it includes data on seedling abundance, grass cover and light levels for a grass removal/seed addition experiment . All sites were within Hakalau Forest National Wildlife Refuge on Hawaii Island. This study looked at multiple biotic interactions that potentially lead to self-reinforcing feedbacks within intact forest and degraded forest sites. Specifically, this data set addresses bird-mediated seed rain as measured by aerial seed rain traps under koa and ʻōhiʻa trees along two transects moving from intact forest uphill into restoration... Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii, avian diet, botany, ecology, All tags... exotic grass, forest resources, forest restoration, land use change, plant competition, plant ecology, seed limitation, seedling recruitment, tropical forest dynamics, Fewer tags Avian diet data for Hakalau Forest, Hawaii, 2012-2016 This data release includes data and metadata on 1) avian diet 2) seed rain 3) understory plant composition 4) seedling abundance and 5) sampling locations for these sites. In addition it includes data on seedling abundance, grass cover and light levels for a grass removal/seed addition experiment . All sites were within Hakalau Forest National Wildlife Refuge on Hawaii Island. This study looked at multiple biotic interactions that potentially lead to self-reinforcing feedbacks within intact forest and degraded forest sites. The avian diet data, in particular, encompasses three years of fecal sample collection from spring time mist netting activities. We identified all seeds that were found in fecals to give an idea... Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii, avian diet, botany, ecology, All tags... exotic grass, forest resources, forest restoration, land use change, ornithology, plant competition, plant ecology, seed limitation, seedling recruitment, tropical forest dynamics, Fewer tags Seedlings and cover data for Hakalau Forest, Hawaii, 2012-2016 This data release includes data and metadata on 1) avian diet 2) seed rain 3) understory plant composition 4) seedling abundance and 5) sampling locations for these sites. In addition it includes data on seedling abundance, grass cover and light levels for a grass removal/seed addition experiment . All sites were within Hakalau Forest National Wildlife Refuge on Hawaii Island. This study looked at multiple biotic interactions that potentially lead to self-reinforcing feedbacks within intact forest and degraded forest sites. This data in particular quantifies natural seedling regeneration in our sites, and the cover of different substrates and vegetation in the immediate area of these seedlings. Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii, avian diet, botany, ecology, All tags... exotic grass, forest resources, forest restoration, land use change, plant competition, plant ecology, seed limitation, seedling recruitment, tropical forest dynamics, Fewer tags Hawaii Island forest bird phenology and morphometrics from 1994 to 2020 We examined data from multiple studies (1994-2020) conducted across the avian annual cycle, from multiple locations, to evaluate molt patterns and establish criteria for assignment of age and sex based on the WRP (Wolfe-Ryder-Pyle) method, or molt-cycle age classification system designed specifically for tropical species. In addition, we describe the phenologies of molt and breeding and quantify the differences in males and females based on plumage coloration and morphometrics for eight native species. This data release includes two tabular datasets, one containing breeding phenological data and the other containing morphometric data. The phenological data presents information of active breeding condition in birds... Categories: Data; Tags: Hawaii forest birds, Island of Hawaii, Molt, USGS Science Data Catalog (SDC), Wildlife Biology, All tags... biota, morphometric measurements, Fewer tags Hawaii Volcanoes National Park stable isotope values from Hawaii forest birds 2012 Blood and feathers were collected from Hawaii forest birds (Apapane and Hawaii Amakihi) in high elevation forest to assess evidence for altitudinal movement. Feathers, red blood cells and plasma were analyzed for hydrogen, carbon, and nitrogen stable isotope ratios, and these were used to infer changes in elevation and diet over time. For each species, at one of 3 sites, isotope values from one or more tissues and isotopes are listed. Categories: Data; Tags: Altitudinal movement, Ecology, Hawaii Volcano National Park, Hawaii forest birds, Kau Forest, All tags... Stable isotopes, USGS Science Data Catalog (SDC), Wildlife Biology, biota, Fewer tags Seedlings in experimental plots, Hakalau Forest, Hawaii, 2015 This data release includes data and metadata on 1) avian diet 2) seed rain 3) understory plant composition 4) seedling abundance and 5) sampling locations for these sites. In addition it includes data on seedling abundance, grass cover and light levels for a grass removal/seed addition experiment . All sites were within Hakalau Forest National Wildlife Refuge on Hawaii Island. This study looked at multiple biotic interactions that potentially lead to self-reinforcing feedbacks within intact forest and degraded forest sites. Specifically, this data describes seedling recruitment in experimental plots where we add seed and removed grass to ask what limits seedling recruitment in this ecosystem. Categories: Data; Tags: Hakalau Forest National Wildlife Refuge, Hawaii, avian diet, botany, ecology, All tags... exotic grass, forest resources, forest restoration, land use change, plant competition, plant ecology, seed limitation, seedling recruitment, tropical forest dynamics, Fewer tags